Senate majority leader expected to meet with PM Netanyahu, President Herzog and senior opposition figure Benny Gantz

Husband of former Jewish congresswoman Gabby Giffords, who survived assassination attempt, gives Democrats 48 seats in upper chamber

First section of Wednesday's convention dedicated to gun control; other topics include undocumented migrants and climate change -- and especially the rise of women in politics

Researchers study Scott Kelly, who spent a year on the International Space Station, and his identical twin Mark Kelly, also a former NASA astronaut, who stayed on the ground